Matrix Chapter 5 Review (midterm)

Name the dimensions:

• 6x2

• 2x6

• 12

• 36

How many columns are there in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

How many rows are in a 7 x 3 matrix?

• 7

• 3

• 21

• 10

Which of the followings is True?

• x=2, y=4, z=6

• x=4, y=2, z=6

• x=2, y=6, z=4

• x=6, y=4, z=2

Find B-A

• -3 1

  7 -1

• 1 0

  1 -4

• 4 0

  -6 1

• not possible because rows do not match columns

Find A+B

• 8 10

  8 1

• 12 25

  7 1

• 10 30

  0 1

• can't add two together because the rows dont match columns

Multiply the scalar on the outside of the matrix by every term (number) on the inside of the matrix.

• -27 -45

  -81 -36

• -27 45

  -81 36

• 45 -27

  36 -81

• 27 -45

  81 -36

Multiply

• undefined

• 
• 
• 

• 
• 
• 
• 
• 

Find 2A-3B

• -3 1

  7 -1

• 1 0

  1 -4

• -4 0

  6 -1

• -14 -5

  11 -3